Numericals on Symmetrical Fault Analysis | Part 1

[@DrAfrozAlam]

Download Fault Analysis handwritten lecture notes (pdf) using the following links: drive.google.com/file/d/18Zvgdi3YD6iAIkWJwz5-s7dVHRgM6lwZ/view?usp=sharing drive.google.com/file/d/1sfMf8BDsZ1BlKoehLLkokwizgtWHIbrr/view?usp=sharing drive.google.com/file/d/1eYOtrSzN7VwsqiLwjnrJ79BQd2LcE_Vy/view?usp=sharing

[@justinvantony5056]

Sir I dont know how to express my thanks to u. I have failed this paper and I have been writing supply exams for last 4 years. I couldn't understand any word from this subject due to the complexity of the numericals and theories. But after watching u r video luctures, I can understand each and every portions of this subject easily and very quickly. The only despairI have that ,why didnt u do this before 4 years ,😃

[@DrAfrozAlam]

Thank you so much Justin V Antony for such an appreciating feedback.

[@DrAfrozAlam]

I have shared your comment on my Facebook page m.facebook.com/story.php?story_fbid=2899259496755140&id=100000133556053&sfnsn=scwsctalcntmo

[@justinvantony5056]

Sir today my power system exam was conducted. This time, I am really sure sir that I am going to pass this exam. Definitely sir. Thank u sir, thank u so much ❤

[@DrAfrozAlam]

👌👌👌

[@justinvantony5056]

@@DrAfrozAlam Sir, the result is published and I am really happy to say to you that I am passed the exam with 60% above. Really thanks to u sir for ur precious classes. Thank you sir thank you so much ❤❤❤

[@Binilbabu42]

Great Lecture..! Especially the explanation for sub transient and transient sections...!👌

[@Aspirant-lp8cw]

Good explanation sir especially transient and sub-transient reactance concept.....👍

[@emadeldeen2200]

Sir... From Egypt 🇪🇬 I send for you all greats. You are a magnificent teacher. I have watched your lectures. And really you are a genius in explaining With easy way. And very clear writing

[@DrAfrozAlam]

Thanks a lot dear

[@niyaznagvi3162]

Asalamalykum Sir i don't have words to appreciate your numerical solving analysis with such a Crystal clear Concepts your lectures are very very... helpful May ALLAH (SWT) give U the best in the world and in Akhira as well...

[@DrAfrozAlam]

Wa Alaikum Assalam Niyaz. Jazakallah for the wonderful wishes.

[@yugaljain9915]

very nice lectures sir....lot of love from HBTU Kanpur

[@khairunwala1212]

Sir Masha Allah se kia padhhate hain sap. Bahut hi mushkil concepts bahut hi aasani se bayan kar dete hain.

[@DrAfrozAlam]

Shukriya Khairun Wala

[@samuelenjebo4054]

interesting lecture thank u sir i am from ethiopia

[@surendrakverma555]

Thanks and Regards Sir 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@shahudulain2069]

Much Appreciated Sir.

[@DrAfrozAlam]

Thank you Shahudul Ain

[@RAHULNIGAM1985]

Sir. I have a doubt In case of neutral point grounded through NER , the zero sequence network is drawn taking ground as reference... However , the positive and negative sequence networks are drawn wrt to neutral as reference... So when we draw a network diagram connecting these three sequence networks ... How do we fix that... Like in star solidly grounded...N and G are at same potential ...so we can just combine these easily.. But in NER grounded...N & G are at different potentials when zero sequence current flows...

[@gustavomarcelo7250]

For calculating symmetrical fault, we can use symmetrical component by using the pos. sequence network, or Z bus method. Can we use Z bus matrix to calculate LG,LL fault?

[@rkjogi6984]

Sir high voltage engg k bhi daliye

[@naymulhasan8559]

Dear sir I have one question regarding pre fault voltage .Does magnitude of prefault voltage always equal to one in case of symmetrical fault?

[@DrAfrozAlam]

Yes, if system was unloaded at the time of fault.

[@arundhatipatil4264]

Sir how did we came to know that it is symmetrical fault

[@DrAfrozAlam]

This has already been explained in the following video lecture: kzbin.info/www/bejne/g3OngGOQnM6hqJo

[@roshanchandel7929]

Why don't we consider the neutral impedance while calculating the fault current in case of symmetrical fault? The return path available for the fault current has to pass through the neutral impedance as well.

[@DrAfrozAlam]

To understand this, watch the following lecture (particularly at time 19:38) : kzbin.info/www/bejne/gJaoZZSnl62emLM

[@DrAfrozAlam]

In symmetrical faults, negative and zero sequence components of fault current are absent. i.e. only positive sequence component of fault current exists which does not require path through neutral. Note: Only zero sequence component of current requires its path through the neutral. Recall, neutral current In = 3*Io

[@anandbaheti6681]

Sir where did u discuss about 3phase fault current...why only positive impedence is considered...

[@DrAfrozAlam]

For 3-phase fault current, you may watch following video lecture: kzbin.info/www/bejne/g3OngGOQnM6hqJo In 3-phase faults, only positive components exist. Negative and zero sequence components are absent. For details, you may watch following video lecture: kzbin.info/www/bejne/o4SngJmdqZyknKs

[@narendrababupokuri6745]

Sir please make vedios on load flow

[@DrAfrozAlam]

Dear Narendra, I have already uploaded video lectures on Load Flow. The links for load flow videos are as follows: kzbin.info/www/bejne/bHbZk4mlYpiUotE kzbin.info/www/bejne/fpycpIWOrdp0grM kzbin.info/www/bejne/hHuUeZ6QZ6arjsU kzbin.info/www/bejne/iIa1lHWagJ1mgdU kzbin.info/www/bejne/mYK7poSIq8eNj9k kzbin.info/www/bejne/p6m6lqhtqbqUp6c kzbin.info/www/bejne/inWxqJJondF4n5I kzbin.info/www/bejne/mnavopl4bcR-lc0